I bought my desktop PC about 20 years ago, and since then, I've never upgraded more than two components at once. It is literally Theseus' ship. But I put some effort into keeping it future proof, like buying memory compatible with the next generation motherboard, better modular PSU with power for future video card etc. It is actually quite fun game, especially when your vendor return policy is generous enough to not worry if something won't fit or won't work together.